IMO, there's not a significant difference between any of the bikes offered at that price point. Most are relatively generic aluminum frames (regardless what company's name is on the downtube) with similar componentry (usually Shimano Sora). So, there's no real "right" or "wrong" answer.
The hardest thing for the new cyclist though is getting sizing right, particularly if you are buying via the 'net. Some of the best prices are had on internet bikes (including several off-brands advertised here) but a bike that doesn't fit is no bargain.
Assuming that you are comfortable on the sizing, then it's a fine choice. If you have an experienced cyclist to assist you in evaluating, though, that same $500 can go a lot further on the used market (same sizing caveats apply).